From: Paul Mackerras <paulus@ozlabs.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: benh@kernel.crashing.org, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH V4 07/18] powerpc/mm: Update masked bits for linux page table
Date: Thu, 25 Feb 2016 14:41:13 +1100 [thread overview]
Message-ID: <20160225034113.GF18753@oak.ozlabs.ibm.com> (raw)
In-Reply-To: <1456202900-5454-8-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
On Tue, Feb 23, 2016 at 10:18:09AM +0530, Aneesh Kumar K.V wrote:
> We now use physical address in upper page table tree levels. Even though
> they are aligned to their size, for the masked bits we use the
> overloaded bit positions as per PowerISA 3.0. We keep the bad bits check
> as it is, and will use conditional there when adding radix. Bad bits
> check also check for reserved bits and we oveload some of the reserved
> fields of radix in hash config.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/book3s/64/hash-64k.h | 15 ++++++---------
> 1 file changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
> index f0f5f91d7909..60c2c912c3a7 100644
> --- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
> +++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
> @@ -60,15 +60,12 @@
> #define PTE_FRAG_SIZE_SHIFT 12
> #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
>
> -/*
> - * Bits to mask out from a PMD to get to the PTE page
> - * PMDs point to PTE table fragments which are PTE_FRAG_SIZE aligned.
> - */
> -#define PMD_MASKED_BITS (PTE_FRAG_SIZE - 1)
> -/* Bits to mask out from a PGD/PUD to get to the PMD page */
> -#define PUD_MASKED_BITS 0x1ff
> -/* FIXME!! Will be fixed in next patch */
> -#define PGD_MASKED_BITS 0
> +/* Bits to mask out from a PMD to get to the PTE page */
> +#define PMD_MASKED_BITS 0xc0000000000000ffUL
> +/* Bits to mask out from a PUD to get to the PMD page */
> +#define PUD_MASKED_BITS 0xc0000000000000ffUL
> +/* Bits to mask out from a PGD to get to the PUD page */
> +#define PGD_MASKED_BITS 0xc0000000000000ffUL
Why not fold this into the previous patch? (and include this patch's
commentary in the previous patch's commentary, of course)
Paul.
next prev parent reply other threads:[~2016-02-25 4:53 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 4:48 [PATCH V4 00/18] Book3s abstraction in preparation for new MMU model Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 01/18] powerp/mm: Update code comments Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 02/18] mm: Some arch may want to use HPAGE_PMD related values as variables Aneesh Kumar K.V
2016-02-25 5:06 ` Balbir Singh
2016-02-23 4:48 ` [PATCH V4 03/18] powerpc/mm: add _PAGE_HASHPTE similar to 4K hash Aneesh Kumar K.V
2016-02-23 5:38 ` Paul Mackerras
2016-02-23 9:22 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 04/18] powerpc/mm: Split pgtable types to separate header Aneesh Kumar K.V
2016-02-25 3:12 ` Paul Mackerras
2016-02-25 5:35 ` Balbir Singh
2016-02-23 4:48 ` [PATCH V4 05/18] powerpc/mm: Don't have conditional defines for real_pte_t Aneesh Kumar K.V
2016-02-25 3:24 ` Paul Mackerras
2016-02-25 6:03 ` Balbir Singh
2016-02-23 4:48 ` [PATCH V4 06/18] powerpc/mm: Switch book3s 64 with 64K page size to 4 level page table Aneesh Kumar K.V
2016-02-25 3:39 ` Paul Mackerras
2016-02-26 2:07 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 07/18] powerpc/mm: Update masked bits for linux " Aneesh Kumar K.V
2016-02-25 3:41 ` Paul Mackerras [this message]
2016-02-26 2:08 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 08/18] powerpc/mm: Copy pgalloc (part 1) Aneesh Kumar K.V
2016-02-25 4:27 ` Paul Mackerras
2016-02-26 2:11 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 09/18] powerpc/mm: Copy pgalloc (part 2) Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 10/18] powerpc/mm: Copy pgalloc (part 3) Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 11/18] powerpc/mm: Hugetlbfs is book3s_64 and fsl_book3e (32 or 64) Aneesh Kumar K.V
2016-02-25 5:41 ` Paul Mackerras
2016-02-26 9:57 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 12/18] powerpc/mm: Use flush_tlb_page in ptep_clear_flush_young Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 13/18] powerpc/mm: Move hash related mmu-*.h headers to book3s/ Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 14/18] powerpc/mm: Create a new headers for tlbflush for hash64 Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 15/18] powerpc/mm: Move hash page table related functions to pgtable-hash64.c Aneesh Kumar K.V
2016-02-25 4:32 ` Scott Wood
2016-02-26 10:00 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 16/18] powerpc/mm: THP is only available on hash64 as of now Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 17/18] powerpc/mm: Use generic version of pmdp_clear_flush_young Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 18/18] powerpc/mm: Move hash64 specific definitions to separate header Aneesh Kumar K.V
2016-02-23 9:26 ` [PATCH V4 00/18] Book3s abstraction in preparation for new MMU model Aneesh Kumar K.V
2016-02-25 4:34 ` Scott Wood
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